Windom Antenna Home Page, and Handbook  The transition from single wire to Coaxial Feeding        The Windom has now become possibly the most popular multi band HF wire antenna ever. In the early days of the Windom, it was fed with a single wire, connected at a sweet spot approximately 1. Several years later and after the advent of the BALUN, the Windom received a slight modification to enable the use of coaxial cable instead of the single wire. By using an antenna analyzer and a Boonton antenna bridge, the sweet spot became the feed point of the Windom. The Boonton antenna bridge and the antenna analyzer resolved a slightly different sweet spot that displayed an impedance measuring between 2. Z.   With the introduction of a BALUN at the feed point, using coaxial cable as RF feedline to the WindonOCF became simplicity in itself. My Introduction to BALUNs I was first introduced to BALUNs when I read papers written in 1. Alan Newman Jr, for his post graduate thesis while he was attending the Naval Academy at Monterey, California. For the moment, my BALUN reference had been by Gaunella and some papers from other sources. After a stint in the U S Marine Corps, I used my benefits to acquire more knowledge in RF and Electronics design. In in the midst of these learning curves BALUNs really caught my attention. As time went on, BALUNs began to come into use almost everywhere. Some of my early BALUN learning happened while I was attending Lee De. Forest Institute now De. Vry University at 4. Belmont Avenue in Chicago, Illinois. In my studies I learned about every facet of Electronic and RF communications that was available. BALUNs had come into their own as they were finding their place in standard broadcast applications. It was during the period while attending De. NPRs Book Concierge Our Guide To 2014s Great Reads. Nicole Cohen, David Eads, Rose Friedman, Becky Lettenberger, Petra Mayer, Beth Novey and. Watch the best of Channel 4, E4 and More4 on demand. Includes a huge catch up window, an everexpanding library of programmes, original shorts, exclusive shows and. Forest Institute that I took a part time employment with a company that manufactured all type of transformers. The company was Chicago Standard, now called Stancor. At Stancor, we also manufactured a form of BALUN for the standard broadcast industry that later would simplify or reduce the size of the tower base tuning unit or dog house. This gave me a better understanding as to the how, and why, these devices were necessary to provide maximum transfer of RF energy from the transmitter and tuning unit into the antenna. Thus the term  Transmission Line Transformer TLT found its place in our RF applications, both commercial and hobby. One of our most popular BALUNs employed in Amateur Radio applications is the Guanella 4 to 1 current type BALUN. The 4 to 1 BALUN is the BALUN most used with the true Windom Antenna, simply because it more closely matches the 2. Windom antenna, when installed between 2. When we read some of the ARRL handbook and various Antenna books, the ARRL doesnt describe a Guanella BALUN. Stronghold V1 4 Patch. They actually refer to it as a 4 1 balanced impedance matching transformer. In a manner of speaking, this is a small part of what it does. Some HAMs change it into a BALUN of sorts by connecting one side of the balanced output to ground. When it is connected in this manner, it becomes a voltage BALUN and thus it has no way to limit common mode currents. BUXCOMM manufactures and uses only current BALUNs. I/51az%2BtnrX6L.jpg' alt='Handbook Of The Birds Of The World Complete Series' title='Handbook Of The Birds Of The World Complete Series' />Voltage BALUNs are special order built only. Technology Evolution Lets stop a moment to interject a bit of history, better yet, some of the evolution in technology from those days to the present. Our calculators in 1. LED and micro processor devices of today. To give you some idea of the mechanical calculators we used in those days,  look over the two items shown here. They were called Slide Rules, or in our slang terms of that day and age. Slip Sticks.   They may be a bit out of date, but these tools of the Electronic Engineering profession were very accurate. TOP/lin0991_1.jpg' alt='Handbook Of The Birds Of The World Complete Series' title='Handbook Of The Birds Of The World Complete Series' />HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2 Passerines. Describes the memberships, activities and outings of this Durban club. Leave it to Beaver box set The Complete Series all 6 seasons including the bonus pilot episode. Welcome to The Windom Antenna Handbook Home Page. The best deals in Ham Radio equipment, sales, and service are at BUXCOMM. Discount prices on. HBW-Special%20Volume_800.jpg' alt='Handbook Of The Birds Of The World Complete Series' title='Handbook Of The Birds Of The World Complete Series' />The Slide. Rule at top of photo is my U S Marine Corp U S Navy issue, the lower Slip Stick is the slide rule issued to me as one of my Advanced Engineering Tools by Cleveland Institute of Electronics. Note  Both slip sticks are Pickett, the US military version is made of hardened, precision laminated bamboo, while the CIE version is made of Hard Drawn magnesium. Virtua Tennis 5 Pc. Yes, there were some K E slip sticks, but I never saw one until I went to Cal Tech. Many of todays Hams moved away from imparting credit to the original designers of the Windom. They are trying to call it an Off Center fed dipole, or OCF. In either application, the Windom is still a Windom, by whatever name or title we assign to it. As I stated before Call it what you like, OCF, OCFD, or the name for which it is named. Windom.  If it walks like a duck, quacks like a duck, looks like a duck. Its a DUCK   Throughout this and many other antenna related documents this is true. To avoid any further confusion, well use Windom to reference both titles and labels. Windom andor OCF. Today, many Hams are using this multi band, HF WindomOCF antenna with satisfying results. This is one of the reasons that WindomOCF antennas are being deployed worldwideNot only is this antenna a great HF antenna, it also exhibits gain greater than dipoles that are installed for single band operation. Another feature of the WindomOCF antenna is the greater bandwidth on each band than that of a single band wire type antenna. Of course the best feature of all is that no antenna tuner is necessary. Because of the harmonic relationships of second, third, fourth, etc, harmonics, the Windom excels. The only reason an antenna tuner might be used is when an unrelated harmonic band or frequency is employed. As built, the Windom can be made to operate 1. Fifteen 1. 5 meters is missing from the list because it is not a harmonic multiple of any of the aforesaid bands. To remedy this issue with 1. We will not go into deep theory relating to why, but make only one point referencing the Carolina Windom. In tests by us and many other users, the original coaxial fed Windom out performed and exhibits more than two 2 d. B gain over the so called Carolina Windom. In 1. 95. 8 I read more papers by Gillette Guanella which referenced a current type BALUN. I came across Thomas OMearas papers, Analysis and Synthesis with the Complete Equivalent Circuit for Wide Band Transformer. This is when I made some design changes to the original Windom antenna. In 1. I met Lew Mc. Coy W1. ICP SK.   Lew filled in a lot of blanks I needed answers to We talked about the Windom antenna and how we were building them. Lew had some ideas that I  felt had enough merit to give them a tryI made the changes and Lews current type BALUN design gave us the bandwidth that we needed to turn the WINDOMinto an eight 8 band, plus HF antenna even adding some VHF bands. An old theory A new design   THE WINDOM ANTENNABefore we get into the core of our topic, I have to clear some misgivings and challenges to my arithmetic from a few new HAMs who want to add notches to their six shooters. I first wrote this article in February 1. MOL more or less, Ive presented the reader of this article with the correct formulae to determine the Windom dimensions. In recent years a few new HAMs who cannot see the forest for the trees By that, I mean, they look at the formula that I use, but they dont look at the frequency I use to determine the final answer result. Some of us like to operate in the lower, or CW portions of the HAM bands, and in the case of 2. PSK3. 1 near 1. 40.